US Bridges

Oakes Ave over I-90

Fair

Kittitas County, Washington · 29.5 E JCT SR 906 · Structure no. 0007582A0000000

Built
1965
60 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
225 ft
4 main spans
Daily traffic
895
2012 count
Owner
State
State Highway Agency

About this bridge

Oakes Ave over I-90 is a prestressed concrete stringer/multi-beam or girder carrying Oakes Ave over I-90 in Kittitas County, Washington. It was built in 1965, so it is 60 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 895 vehicles a day, roughly 18% of them trucks. The structure is 225 ft (68.6 m) long and 34 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesOakes Ave
CrossesI-90
Location29.5 E JCT SR 906
RouteCity Street 0
Coordinates47.19089, -120.93633
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.9 US tons
Inventory rating46 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length225 ft (68.6 m)
Longest span75 ft (22.9 m)
Deck width34 ft (10.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic895 (2012)
Projected traffic—
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Oakes Ave over I-90 built?

It was built in 1965, making it 60 years old in 2025.

What condition is Oakes Ave over I-90 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2024.

How much traffic does Oakes Ave over I-90 carry?

About 895 vehicles per day (2012 count), of which roughly 18% are trucks.

How long is Oakes Ave over I-90?

The structure is 225 ft (68.6 m) long with a longest span of 75 ft (22.9 m) and a deck 34 ft wide.

Who owns Oakes Ave over I-90?

It is owned by the State Highway Agency.